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Yes, variables can have a value of undefined and you can explicitly assign values to them What is the difference between == and === (it's hard to search google for === )? Assigning undefined to a variable though is probably confusing, since it's a bit of a paradox (you've defined the variable as undefined) and it's not possible to distinguish that variable from either variables that don't exist or uninitialised variables.

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While literally using the keyword undefined, boolean(undefined) works, trying that with an undefined variable doesn't work, and that is the whole point of doing the check for null or undefined. How do i check a variable if it's null or undefined and what is the difference between the null and undefined As typeof returns undefined, undefined is a type where as null is an initializer indicates the variable points to no object (virtually everything in javascript is an object).

390 the jquery core style guidelines suggest two different ways to check whether a variable is defined

Typeof variable === undefined local variables Object.prop === undefined why does jquery use one approach for global variables and another for locals and properties? Typeof foo !== 'undefined' window.foo !== undefined 'foo' in window the first two should be equivalent (as long as foo isn't shadowed by a local variable), whereas the last one will return true if the global varible is defined, but not initialized (or explicitly set to undefined). How do i check if an object property in javascript is undefined?

But if v isn't assigned anything, or gets another falsey value, x will get 10. Undefined is a variable, not a constant, and can be assigned a value Because of this, one school of thought says the second path is safer, since you cannot be sure of the value of undefined.